Knowing when to replace your home’s windows isn’t always as clear as it may seem. If your home is older than 15 years, it’s probably a good time to check and make sure your windows are still operating correctly. For instance, do you have trouble opening or closing your windows? Do you consistently find moisture on your windows’ interior? Just like your washing machine, refrigerator, or roof shingles, over time, your windows and doors need to be replaced. To help you through the replacement process, Andersen provides the following tips and solutions to help determine if the time to replace—and upgrade—is now.